Question

The codal provisions recommend minimum shear reinforcement in the form of stirrups in the beams
1. to cater for any torsion in the beam section
2. to improve ductility of the cross section
3. to improve dowel action of longitudinal tension bars
Select the correct answer using the codes given below:

• A. 1, 2 and 3
• B. 2 and 3
• C. Only 1
• D. Only 2

Answer 1

The correct option is A 1, 2 and 3

The equivalent shear, a function of the actual shear and torsional moment is detern1ined from the following empirical relation:
$V_e=V_u+1.6\left(T_u/b\right)$

where
$V_e$ = equivalent shear,
$V_u$ = actual shear,
$T_u$ = actual torsional moment,
$b$ = breadth of beam.
Minimum shear reinforcement is to be provided as per cl. 26.5.1.6 of IS 456, if the equivalent nominal shear stress ${\tau }_{ve}$ obtained from $V_e$ calculated above, does not exceed ${\tau }_c$given in Table 19 of IS 456.